"I'm pretty nervous. I'm excited," Kardashian mentioned before the big reveal as his fiancee received an ultrasound. "I really want a boy."
A doctor then announced that their unborn child would in fact be a girl. "Rob, it's a girl!" Blac Chyna excitedly exclaimed. "Oh, that's crazy," Rob adds.
Despite his previous comments, the reality star did turn around on the idea of having a girl, mentioning in a confessional, "It's an emotional moment. Me wanting to have a boy, it definitely stems from my dad but I'm sure I'll have the same relationship that I had with my father with my daughter."
"I'm just happy that the baby's healthy and I'm gonna be super happy with a girl," he continued.
Recently, the 29-year-old shared a throwback photo of himself and his late father Robert Kardashian exclaiming that he "can't wait" to be a father himself.
Blac Chyna and Kardashian got engaged in April after dating for three months and later announced her pregnancy a month later. Blac Chyna is already a mother to 3-year-old son King Cairo who she shares with ex Tyga, who is currently dating Kardashian's half-sister Kylie Jenner.
New episodes of Rob & Chyna debut every Sunday at 9 p.m. on E!